The preparation of the V/Al2O3 (10 weight %) catalyst was done according the work of Argyle et al. (36). Ammonium metavanadate (227 mg) and oxalic acid (454 mg) were added to deionized water (1.5 ml) and stirred under complete dissolution. Then, alumina (1 g) was impregnated with the solution, dried at 120°C for 10 hours, and calcined at 500°C for 3 hours. The preparation of catalyst-coated reactors was done according to our recent work (17). Briefly, the catalyst deposition was carried out by controlled immersion of the structured supports in ethanolic suspensions (0.5 g of catalyst in 30 ml) inside an ultrasonic bath for 15 min, followed by calcination for 2 hours at 250°C. This process was repeated several times until the desired catalyst loading was achieved (~100 mg of total V/Al2O3 loading) per monolith (diameter and length, 15 mm).

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